<template>
    <el-container class="home-container">
        <!-- 头部 -->
        <el-header>
            <div>
                <img src="../assets/heima.png">
                <span>电商后台管理项目</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <el-container>
            <!-- 侧边栏 -->
            <el-aside class="el-aside" :width="isCollapse ? '64px' : '200px'">
                <!-- 折叠按钮 -->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <el-menu background-color="#545c64" text-color="#fff" active-text-color="#409EFF" :unique-opened="true" :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">                 
                    
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
                      <template slot="title">
                        <i :class="iconsObj[item.id]"></i>
                        <span>{{item.authName}}</span>
                      </template>

                      <!-- 二级菜单 -->
                      <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                              <i class="el-icon-menu"></i>
                              <span>{{subItem.authName}}</span>
                            </template>
                      </el-menu-item>

                    </el-submenu>
                </el-menu>
            </el-aside>

            <!-- 右侧主体 -->
            <el-main>
              <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
  data() {
    return {
      //左侧菜单数据
      menuList: null,
      iconsObj: {
        '125':'el-icon-user-solid',
        '103':'el-icon-lock',
        '101':'el-icon-shopping-bag-2',
        '102':'el-icon-s-order',
        '145':'el-icon-s-marketing'
      },
      //是否折叠
      isCollapse: false,
      //被激活的链接地址
      activePath: ''
    }
  },
  created() {
    // 在生命周期中的created阶段请求左侧菜单数据
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem("activePath")
  },
  methods: {
    logout() {
      //清空token
      window.sessionStorage.clear();
      //跳转到登录页
      this.$router.push("/login");
    },
    async getMenuList() {
      //发送请求获取左侧菜单数据
      const { data: res } = await this.$http.get('menus');
      if (res.meta.status !== 200) return this.$message.console.error(res.meta.msg);
      
      this.menuList = res.data;
      // console.log(res)
    },
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath
    }
  }
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  background-color: #373d41;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    > span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    //解决边框对不齐的效果
    border-right: 0;
  }
}
.el-main {
  background-color: #eaedf1;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
.el-aside {
  transition: all .5s;
}
</style>